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Soil Suitability / Nitrate Loading Study <br />Ernst Property ■Tracy,CA <br />February 21, 2019 revised April 9, 2019 ■ Terracon Project No.NA197000 <br />Responsive ■Resourceful ■Reliable 8 <br />1.4.5 Groundwater Sample Handling <br />Not applicable. Refer to Section 1.4.3. <br />1.5 Soil Profile and Geologic Information <br />The site is depicted on the Geologic Map of California 2010, as within generalized quaternary <br />Pleistocene and Holocene deposits which are comprised primarily of unconsolidated and semi- <br />consolidated alluvium, lake, playa, and terrace deposits. <br />Terracon reviewed the United States Department of Agriculture (USDA) Natural Resources <br />Conversation Service (NRCS)Web Soil Survey and USDA Soil Survey of San Joaquin County <br />(1992) for information regarding soil properties. Based on information obtained from the USDA <br />sources, the site consists of Capay clay soils with 0 to 1 percent slopes. Parent material is clayey <br />alluvium derived from sedimentary rock. Typical soil profiles consist of 0 to 60 inches clay. Capay <br />clay soils are moderately well drained with high runoff potential, slow permeability, and high shrink <br />swell potential. For sites with septic systems, permeability can be improved by increasing the size <br />of the absorption field, backfilling leachfield trenches with sandy material, and installing long <br />absorption lines. <br />1.5.1 Soil Boring Locations <br />Percolation test boring (B1) is located near the northeastern portion of the site approximately 26 <br />feet south of the northern fence line and 65 feet west of the eastern fence line. Soil boring (B2) <br />was located approximately 10 feet west of boring B1. Refer to Appendix A, Exhibit 2 for the boring <br />locations. <br />1.5.2 Soil Boring Dimensions <br />Soil borings B1 and B2 were advanced with a 4 inch diameter hand auger. Boring B1 was <br />excavated to a depth of 3.0 feet bgs and boring B2 was excavated until refusal at a depth of <br />approximately 3.58 feet bgs. <br />1.5.3 Soil Lithology Observed <br />The following table presents a log of the soil boring(s). Boring logs are included in Appendix D. <br />Table 4. <br />Summary of Soil Lithology. <br />Boring Depth Interval (feet)Soil Type Unified Soil <br />Classification <br />B1 0.0 to 2.5 Lean clay, fine grained, <br />brown CL